FYI, Nicholas has 8 HP. And he is very far from being good at any kind of combat (with his ranged skills being the most passable by far).
Alright then, but I'm a little clueless on what to do, as of her current personality Sheila would make a mad dash away from the creature leaving Nicholas to his doom. But I don't know how fast the creature moves or if I can beat it with Sheila's current abilities. And if I stay Sheila will most likely die and that'll be the end of the campaign; so I'm completely stuck at what to do here.